[metrics-bugs] #22280 [Metrics/metrics-lib]: check tests and parsing for duplicate keys and empty keys exceptions

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#22280: check tests and parsing for duplicate keys and empty keys exceptions
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     Reporter:  iwakeh               |      Owner:  metrics-team
         Type:  enhancement          |     Status:  new
     Priority:  Medium               |  Milestone:
    Component:  Metrics/metrics-lib  |    Version:
     Severity:  Normal               |   Keywords:
Actual Points:                       |  Parent ID:
       Points:                       |   Reviewer:
      Sponsor:                       |
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 This was discovered in #22217 in ExtraInfoDescriptorTest's padding-count
 tests (comments 6,7).
 Check other tests in ExtraInfoDescriptorTest and other test classes for
 similar issues and fix these

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22280>
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